Breaking Cover (Life Lessons Series #2) by Kaje Harper
For homicide detective Mac, it's been a good year. Having Tony to go home to makes him a better cop and a better person. For Tony, it's been hard being in love with a man he can't touch in public. Evasions and outright lying to friends and family take a little of the shine off his relationship with Mac, but Tony is determined to make it work.
As the Minneapolis Police Department moves into a hot, humid summer, Mac is faced with a different challenge. A killer has murdered two blond women, and the police have no real clues. Mac hates to think that another murder may be the only way they'll make progress with the case. But when that murder happens, it hits close to home for Tony. And suddenly Mac faces an ultimatum: come out into the sunlight and stand beside Tony as his lover, or walk away and live without a piece of his heart.